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1.
李纪锁  沈火林  石正强 《遗传》2006,28(4):458-462
选择2个番茄红素含量显著不同的鲜食番茄品系,通过P1、P2、F1、F2、B1和B26世代联合分析法,研究分析了番茄红素的遗传规律。结果表明:番茄红素的遗传符合一个主基因和加性-显性-上位性多基因模型,主基因遗传力在B1、B2和F2分别为6.85%、34.78%和58.33%,多基因遗传力在B1、B2和F2分别为58.48%、30.69%和0。   相似文献   

2.
王悦冰  徐世昌  徐仲  刘太国  蔺瑞明 《遗传》2006,28(3):306-310
Vilmorin23是小麦条锈菌国际鉴别寄主和国际上重要抗源材料。采用SSR技术,利用由Vilmorin23为基因供体转育而成的小麦抗条锈近等基因系Taichung29*6/YrV23,选用YrV23所在2B染色体上的55对SSR引物,对Taichung29*6/ YrV23及其轮回亲本Taichung29和抗性基因供体Vilmorin23的基因组DNA进行PCR扩增和聚丙烯酰胺凝胶电泳分析。结果显示,引物Xwmc356在近等基因系与轮回亲本间扩增出特异性DNA片段,经F2代群体150个抗、感单株检测证实,该片段位点与抗条锈病基因YrV23有连锁关系,遗传距离为9.4 cM。Xwmc356可作为抗条锈基因YrV23的SSR标记。   相似文献   

3.
家蚕催青后期胚胎蛋白质双向电泳图谱分析   总被引:12,自引:1,他引:11  
采用蛋白质双向电泳技术分析了家蚕Bombyx mori催青后期胚胎蛋白质图谱的变化。研究发现: 在头胸分化期(戊3)、反转期(己1)、毛瘤发生期(己2)、点青期(己3)、转青期(己4)和孵化期(己5)胚胎蛋白质的双向电泳图谱中共检测到209个特异蛋白斑点,其中己3和己4两个胚胎出现的特异蛋白斑点数在整个催青期胚胎中为最多,分别达55和77个。与催青前期胚胎出现的特异蛋白斑点变化规律相似,这些特异蛋白斑点大多也是在随后邻近的胚胎发育中消失。推测这些特异蛋白可能与相应胚胎的形体特征发育有关。  相似文献   

4.
La(NO3)3浸种对NaCl胁迫下红小豆幼苗生长的影响   总被引:1,自引:0,他引:1       下载免费PDF全文
采用向1/2Hoagland营养液中按一定比例添加中性盐(NaCl)模拟盐胁迫的方式,研究了La(NO3)3浸种对盐胁迫下红小豆(Phaseolus angularis)幼苗生长的影响。结果表明:(1)与对照组相比,盐胁迫不同程度地降低了红小豆幼苗的株高、叶面积、地上部分鲜重、总根数及根系活力、根苗SOD、POD、CAT活性等,明显增加了根苗MDA含量水平。(2)使用适当浓度的La(NO3)3浸种可以提高对照组和盐处理组红小豆的株高、叶面积、总根长、总根数、叶绿素、根活力及SOD、POD和CAT活性,也可以显著降低根苗MDA含量水平,且大多表现出在盐胁迫下变化幅度高于正常处理。La(NO3)3浸种有利于缓解盐胁迫带来的不良影响。(3)低浓度的La(NO3)3浸种处理能够提高红小豆幼苗的耐盐性,缓解盐胁迫伤害,而高浓度处理则加剧了盐胁迫伤害。30mg/LLa(NO3)3浸种对提高红小豆幼苗耐盐性的效果最好。  相似文献   

5.
孔铭华  王春雨  裴黎  涂政  马贵富  叶健 《遗传》2006,28(1):17-20

应用复合PCR扩增技术和荧光毛细管DNA自动电泳分型的方法,使用国产试剂盒,检测Penta E位点在中国畲族、锡伯族、壮族和藏族中的基因频率分布情况。获得了4个民族各约100名无关个体的Penta E位点的等位片段及基因型频率,共发现20个等位片段,其频率分布在0.0048~0.2396之间。各民族的平均杂合度为0.8838,平均个体识别力0.9748,平均非父排除率0.7635,平均多态信息总量0.8950。研究表明Penta E位点属高杂合度、高识别能力的遗传标记,是法庭科学亲子鉴定和个体识别的理想位点。   相似文献   

6.
研究人黑色素浓集激素受体2(MCHR2)基因特异的小发夹RNA(shRNA)真核表达载体pGenesil-1-MCHR2-shRNA对MCHR2表达及特征的影响.将pGenesil-1-MCHR2-shRNA转染到稳定表达人MCHR2基因的CHO细胞中,通过RT-PCR和 Western印迹检测MCHR2表达的变化;放射性配体结合实验(RBA)检测受体最大结合容量B max及平衡解离常数Kd值的变化;钙流检测实验观察配体MCH刺激后单个细胞Ca 2+释放及MCH半数有效浓度EC50的变化.与转染pGenesil-1空载体组比较,pGenesil-1-MCHR2-shRNA 能使MCHR2基因mRNA表达减少45.8%~66.4%;蛋白表达减少44.2%~81.0%; B max减少39.4%~78.7%,Kd值升高40.9%~81.9%;EC 50升高114.8%~822.4%.MCHR2基因shRNA真核表达载体能有效抑制MCHR2基因的表达,减少Bmax、升高Kd值及EC 50,从而对MCHR2生物活性等特征产生影响.  相似文献   

7.
老年斑中存在大量β 淀粉样蛋白(β-amyloid, Aβ)是老年痴呆症(Alzheimer′s disease, AD)的重要病理特征.大量数据表明,Aβ上具有与过渡态金属离子共价结合的位点,二者能结合成为寡聚复合物. Aβ1-40Cu(Ⅱ)复合物通过Cu2+的还原催化O2产生H2O2但反应机制不清.本文尝试以天然抗氧化剂维生素C(VC)来对抗Aβ1-40及Aβ1-40Cu(Ⅱ)复合物产生的H2O2对原代培养的神经细胞的毒性.结果表明,VC能够起到显著的保护作用,其有效浓度为1mmol/L.本文用胞外乳酸脱氢酶泄漏量和H2O2生成量的数据证实了细胞存活率(MTT实验)的实验结果.这些结果表明,Aβ1-40Cu(Ⅱ)复合物能够释放更多的H2O2,引发细胞膜破裂并最终引起细胞死亡.加入VC后,神经元受到的损伤较轻,提示VC在保护细胞免受氧化损伤方面发挥了重要作用.  相似文献   

8.
为了探明Ayu17-449基因在小鼠生长发育过程中的功能, 用特殊的诱捕载体(Gene trapping vector)导入小鼠ES细胞中,5′RACE、Southern blot方法鉴定成功地单一捕获Ayu17-449基因后,由这种ES制作了Ayu17-449 敲除小鼠并用Northern blot方法该基因在突变小鼠体内的表达。结果在Ayu17-449 敲除小鼠体内,诱捕载体位于Ayu17-449基因的翻译起始密码上游,Ayu17-449基因的转录被抑制。表明Ayu17-449敲除小鼠为分析Ayu17-449基因的功能提供了可靠的实验材料。   相似文献   

9.
陆地棉SUPERMAN类似锌指蛋白基因的克隆与表达分析   总被引:4,自引:1,他引:3  
锌指蛋白是生物体内数量最多的转录调控因子,它在动植物的生长发育中都起到十分重要的作用。SUPERMAN类锌指蛋白只含有1个锌指结构。我们根据这类蛋白的保守结构域设计简并引物,通过RT-PCR从棉花中获得了3个这个家族成员的EST,得到1个锌指蛋白基因的全长序列,该基因的编码区长744 bp,编码长248个氨基酸的多肽,其氨基酸序列与GenBank中登录的一个拟南芥RBE蛋白有40%的同源性。此基因被命名为GZFP。它含有保守的锌指结构并在多肽链的C-端具有富含亮氨酸的保守结构域,GZFP含有核定位信号并且没有内含子。GZFP基因在棉花花蕾、子房、花瓣和根中的表达量要高于木质部、韧皮部、叶片、纤维和种子。GZFP基因的表达量很低,在GenBank中没有任何和它同源的EST序列存在。对GZFP 5′侧翼区进行分析发现有数个花粉和根特异表达相关元件,4个与Dof蛋白作用的核心序列,4个与光诱导相关的元件。   相似文献   

10.
在基因枪介导转化的转基因水稻植株中发现1个四倍体变异株系XIP-4N.该变异株系T0代植株中转基因的整合模式与二倍体转基因株系XIP-2N相同,并且二者来自同一转化体系,推测XIP-4N株系是转化后的水稻愈伤组织在细胞有丝分裂过程中发生染色体加倍产生的.对外源筛选标记基因bar和非筛选基因cecropinB在转基因株系XIP-4N和XIP-2N中的遗传行为进行了比较研究.在二倍体转基因株系XIP-2N中,bar和cecropinB基因的Southern整合模式从T0到T2代遗传稳定,单位点整合的bar基因按孟德尔单基因显性方式向后代传递.四倍体转基因株系XIP-4N中外源基因遗传行为复杂,单位点整合的bar基因(Basta抗性)T1代按15∶1分离,T2和T3代中分离行为复杂,而且bar和cecropinB基因的整合模式遗传不稳定.同源四倍体水稻植株减数分裂过程中染色体结构变异、转基因相关位点DNA片段的遗传重组与修饰,以及由此导致配子的育性降低,可能是导致外源基因遗传行为复杂的主要原因.转基因四倍体水稻变异株系XIP-4N携带易于检测的bar基因,为研究同源四倍体水稻的遗传和生殖机理提供了好材料.  相似文献   

11.
12.
Tomato bacterial wilt (BW) incited by Ralstonia solanacearum is a constraint on tomato production in tropical, subtropical and humid regions of the world. In this paper, we present the results of a research aimed at the identification of PCR-based markers amplified fragment length polymorphism (AFLP) linked to the genes that confer resistance to tomato BW. To this purpose, bulked segregant analysis was applied to an F2 population segregating for the BW resistant gene and derived from the pair-cross between a BW resistant cultivar T51A and the susceptible cultivar T9230. Genetic analysis indicated that tomato BW was conferred by two incomplete dominant genes. A CTAB method for total DNA extraction, developed by Murray and Thompson with some modifications was used to isolation the infected tomato leaves. Thirteen differential fragments were detected using 256 primer combinations, and two AFLP markers were linked to the BW resistance. Subsequently, the AFLP markers were converted to co-dominant SCAR markers, named TSCARAAT/CGA and TSCARAAG/CAT. Linkage analysis showed that the two markers are on the contralateral side of TRSR-1. Genetic distance between TSCARAAT/CGA and TRS-1 was estimated to 4.6 cM, while 8.4 cM between TSCARAAG/CAT and TRS-1.  相似文献   

13.
Hawaii 7996, a tomato cultivar resistant to bacterial wilt caused by P. solanacearum was crossed with Floradel, a susceptible cultivar and the F1 and F2 seeds were obtained. Inoculated plants were tested in the field for bacterial wilt resistance and colonization by P. solanacearum. The F1 did not wilt and a significant 3:1 segregation for non wilting: wilting was observed in the F2, indicating a monogenic dominant resistance in Hawaii 7996. In the F2 and in Hawaii 7996, resistance was, associated to the limitation of bacterial spread in the stem. The degree of resistance of Floradel, the F2 and Hawaï 7996 was correlated to colonization at midstem. The usefulness of plant colonization criteria for breeding programs is discussed.  相似文献   

14.
番茄对细菌性斑点病的抗性遗传规律研究   总被引:5,自引:1,他引:4  
利用细菌性斑点病的抗病番茄品种(红珍珠和美味樱桃)和感病品种(中蔬四号、美国大红樱桃和MR),通过常规田间抗感杂交、回交,接种病原菌鉴定子代的抗病性分离情况,统计分析的结果表明,杂交F2代全部抗病,F2代和BC1代的抗感分离比分别符合3:1和1:1的理论分离比,说明了红珍珠和美味樱桃对番茄细菌性斑点病的抗病性为单基因显性遗传。  相似文献   

15.
16.

Key message

Genotyping of disease resistance to bacterial wilt in tomato by a genome-wide SNP analysis

Abstract

Bacterial wilt caused by Ralstonia pseudosolanacearum is one of the destructive diseases in tomato. The previous studies have identified Bwr-6 (chromosome 6) and Bwr-12 (chromosome 12) loci as the major quantitative trait loci (QTLs) contributing to resistance against bacterial wilt in tomato cultivar ‘Hawaii7996’. However, the genetic identities of two QTLs have not been uncovered yet. In this study, using whole-genome resequencing, we analyzed genome-wide single-nucleotide polymorphisms (SNPs) that can distinguish a resistant group, including seven tomato varieties resistant to bacterial wilt, from a susceptible group, including two susceptible to the same disease. In total, 5259 non-synonymous SNPs were found between the two groups. Among them, only 265 SNPs were located in the coding DNA sequences, and the majority of these SNPs were located on chromosomes 6 and 12. The genes that both carry SNP(s) and are near Bwr-6 and Bwr-12 were selected. In particular, four genes in chromosome 12 encode putative leucine-rich repeat (LRR) receptor-like proteins. SNPs within these four genes were used to develop SNP markers, and each SNP marker was validated by a high-resolution melting method. Consequently, one SNP marker, including a functional SNP in a gene, Solyc12g009690.1, could efficiently distinguish tomato varieties resistant to bacterial wilt from susceptible varieties. These results indicate that Solyc12g009690.1, the gene encoding a putative LRR receptor-like protein, might be tightly linked to Bwr-12, and the SNP marker developed in this study will be useful for selection of tomato cultivars resistant to bacterial wilt.
  相似文献   

17.
This study was undertaken to develop tomato plants with broad resistanceto tospoviruses which are a major limiting factor to tomato productionworldwide. A nontransgenic tomato line Stevens-Rodale (S-R), six transgenictomato lines expressing the nucleocapsid (N) protein gene of the lettuceisolate of tomato spotted wilt virus (TSWV-BL), and progeny of the crosses between S-Rand three of the transgenic lines homozygous for the N gene were evaluated fortheir resistance to tospovirus infection in greenhouse inoculation tests. S-Rhas the Sw-5 gene that confers resistance to several TSWVisolates. The six transgenic lines showed high levels of resistance wheninoculated with either TSWV-BL or a tomato isolate from Hawaii (TSWV-H).However, these same plants were highly susceptible to the Brazilian isolate ofgroundnut ringspot virus (GRSV-BR). Plants with the Sw-5gene were resistant to TSWV-BL and GRSV-BR, but were susceptible to TSWV-H.When inoculated with any of the three viruses, the F1 progeny of thecrosses exhibited a susceptible, tolerant, or resistant phenotype with a higherproportion of the plants being either tolerant or resistant. When F2progeny from F1 resistant plants of each cross were inoculated withany of the three viruses, a higher proportion of tolerant and resistant plantswas observed compared to the F1 progeny. Our results show thepotential to obtain broad resistance to tospoviruses by combining transgenicand natural resistance in a single plant.  相似文献   

18.
茄子种质资源抗青枯病的鉴定与评价   总被引:8,自引:0,他引:8  
对304份茄子种质资源进行抗青枯病苗期人工接种鉴定,筛选出免疫材料10份,高抗材料51份,抗病材料35份,中抗材料32份,感病或高感材料176份,分别占鉴定材料的3.3%、16.8%、11.5%、10.5%和57.9%.茄子野生近缘种Solanum sisymbriifolium和S.torvum对青枯病有较强的抗病性,可作为茄子青枯病的抗源材料.获得4份抗青枯病的种间体细胞杂种.茄子对青枯病的抗性遗传较为复杂,主要由多基因控制.  相似文献   

19.
The soilborne pathogen Ralstonia solanacearum is the causal agent of bacterial wilt and attacks more than 200 plant species, including some legumes and the model legume plant Medicago truncatula. We have demonstrated that M. truncatula accessions Jemalong A17 and F83005.5 are susceptible to R. solanacearum and, by screening 28 R. solanacearum strains on the two M. truncatula lines, differential interactions were identified. R. solanacearum GMI1000 infected Jemalong A17 line, and disease symptoms were dependent upon functional hrp genes. An in vitro root inoculation method was employed to demonstrate that R. solanacearum colonized M. truncatula via the xylem and intercellular spaces. R. solanacearum multiplication was restricted by a factor greater than 1 x 10(5) in the resistant line F83005.5 compared with susceptible Jemalong A17. Genetic analysis of recombinant inbred lines from a cross between Jemalong A17 and F83005.5 revealed the presence of major quantitative trait loci for bacterial wilt resistance located on chromosome 5. The results indicate that the root pathosystem for M. truncatula will provide useful traits for molecular analyses of disease and resistance in this model plant species.  相似文献   

20.
Plants respond to bacterial pathogen attack by activating various defence responses, which are associated with the accumulation of several factors like defence-related enzymes and inhibitors which serve to prevent pathogen infection. The present study focused on the role of the defence-related enzymes phenylalanine ammonia lyase (PAL) and polyphenol oxidase (PPO) in imparting resistance to tomato against bacterial wilt pathogen Ralstonia solanacearum . The temporal pattern of induction of these enzymes showed maximum activity at 12 h and 15 h for PAL and PPO, respectively, after the pathogen inoculation (hpi) in resistant cultivars. Twenty different tomato cultivars were analyzed for PAL, PPO and total phenol content following pathogen inoculation. The enzyme activities and total phenol content increased significantly (P < 0.05) in resistant cultivars upon pathogen inoculation. The increase in enzyme activities and total phenol content were not significant in susceptible and highly susceptible cultivars. The role of PAL and PPO in imparting resistance to tomato against bacterial wilt disease is discussed.  相似文献   

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